Mechanism for actuating chucks.



PATENTED MAR. 6, 1906.

B. M. W. HANSON. MECHANISM FOR AOTUATING UHUCKS.

APPLICATION FILED JUNE 6.1903.

5 SHEETS-SHEET 1.

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PATENTED MAE. 6, 1906.

B. M. W. HANSON.

MECHANISM FOR AOTUATING OHUCKS.

APPLICATION FILED JUNE 6. 1903.

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PATENTED MAR. 6, 190B B M. W. HANSON. MEGHANZSM FOR A UTUATING GHUUKS.

APPLICATION FILED JUN 5 SHEETSSHEET 3 IL. I

PATENTED MAR. 6, 1906.

B. M. W. HANSON. MECHANISM FOR AGTUATING OHUOKS.

APPLICATION IlLBD JUNE 6.1903

5 SHEETS-SHEET 4.

mun-11 PATENTED MAR. 6, 1906.

B. M. W; HANSON. MECHANISM FOR AOTUATING OHUOKS.

APPLICATION FILED JUNE 6.1903.

5 SHEETS-SHEET 5.

T A I culiar construction fication.

Bauer M.

Mani-inmate son a "W. HANSON, OF HARTF PRAIT & Yi- HYQNEY COMPANY, OF

JERSEY.

ll i-ll dliil lhf @lli l iilllt.

can, CONNECTICUT, Assicnois TO HARTFORD, coniuicrrcms, z

QTUA'ElNG QE-lUQMis.

no. macaw.

Sinecification of Letters Patent.

Patented March 6, 1906.

Application filed Juno 6, 1903. Serial No. 160,355.

To all whom it may concern.-

it known that 1, Bauer M. W. Hanson, a citizen of Sweden, and a residentof Hartford, in the county of Hartford and State of Connecticut, haveinvented certain new and useful Improvements in Mechanism for ActuatingChucks, of which the followingis aspeci- This invention relates tomechanism for actuating chucks, especially for metal-worlc ing machinesin which stock is to be operated upon by a cutting-tool or similardevice, al though it is not limited. to any specific use.

One of themain objects of the invention is the provision, in connectionwith a chuck, of means for imparting a series of closing impulses tosaid chuck, whereby the stock. will first be gripped and then a finalpowerful clamping movement will be-given the chuckjaws to cause them toclamp firmly stock of any diameter within the capacity of the machine,as will be hereinafter explained.

A further object of the invention is the pro vision of means whereby thechuck-operating device may be operated by independent instrumentolities,neither oi which interferes with the other, although both arecooperative in effect upon the chuclcjaws.

Further objects of the invention are the provision ofchuck-operatingdevices of peand of cooperating stockfeed mechanism, aswill be hcreinaliter described.

' In the accompanying drawings, Figure 1 represents a side view of ahead POL-i011 of a machine to which my invention may be applied. Fig. 2is a central horizontal section on the line of the main spindle. Fig. 3,is a central vertical section of said machine. Fig. 4% is a section, online 4: 4 of Fig. 3. Fig. 5 is transverse'scction on line 5 5 of Fig.Fig. 6 is detail view hereinafter described. Fig. 7 is a side view ofroller-ieed mechanism for feeding the stock. Fig. 8 shows portion ofthechuckhctuating device on an enlarged scale; and Fig. 9 is a similarview showing the parts shifted to open the chuck. Like numeralsdesignate similar parts throughout-the several views. I

n carrying my invention into practice it is to'be understood that it isnot limited to ny particular organization or construction 01 the chuck.In the present instance there is l l I l l l l l shown for illustrativepurposes a chuck which is designated in a general way by the numeral 5and comprises a collet 6, having jaws 7, the outer surfaces ol which aretapered to conform to the similar-l. shaped bore of a head 8, shown asrigid wi i a sleeve 9, the forward movement of which will result inforcing said jaws to clamp the work. Means are provided whereby thesleeve 'i* may be moved rearward, and these me: comprise in the formshown a spring 10, ("llcircling the collet 6, as shown in Fig. Saidsleeve 9 is mounted for longitudinal movevment relatively to a mainsindle 11, in which it is fitted, and the spind e is'journalcd inbearings 3 3 of the machine-frame so that the work which is clamped bythe chuck 5 will be rotated by the spindle.

As above mentioned, my invention comprises devices wherehy the jaws of achuck are first closed upon the evork and are then given a finalclamping action thereon, and these devices may be of any suitable kind.In the resent instance a collar 12 is on an is preferably insorew-threadcd engagement with the spindle 11, although it may beintegral therewith, if desired, and said collar is locked by screw 12,as shown in Fig. 2. Entering nuts 12 of said collar at pointssubstantially opposite each other are sc ews 13, havim right-handthreads 13 at one end and left land threads 13* at the 0pposite end.These left-hand threads 1-3 engage with nuts 14 of a sleeve 14, mountedor sliding movement on the spindle I 1, and levers 15 for operating thechucl-t-actuating sleeve 9 are pivoted at 15'' to the sleeve 14, asshown in Fig. 2.- On its outer surface the sleeve 14 is preferablycylindrical, and itcarries at its forward end a collar 16, providedwith: racks 1.7 in engagement with spiral geai's 18, so that as thecollar 16 is moved longitudinally on the sleeve 14 the gears 18 will berotated, and with them the screws 13, having right and left handsections 13 and This results in moving the sleeve 14 toward oi' awayfrom the collar 12, according to the direction in which the collar 16 isactuated. As shown in Fig. 2, levers 15 are provided adjacent to theirpivots with rojections 15 engaging toe end of the chuclRactuating sleeve9.

From the above description it will be u11- mounted ill Lil

derstood that when the sleeve 14 is actuated toward the right theprojecting abutments 15 of levers 15 will cause a longitudinal movementof the sleeve 9, said movement result ing in preliminarih; closing thechuck-jaws, and inasmuch as the leverage applied to the collar 16 maynot be sufficient to cause said jaws to secure the work firmly and clampstock of ldill'm'ent diameters means are pro-- vided whereby anadditional forward impulse may be imparted to said sleeve 9, as will be'n'esently explained. At their free ends the levers 15 carry rollers 19in engage ment with ca1n-plates 20, secured to the inner surface ofasleeve 21, and said (aim-plates are fitted in grooves 14 of sleeve 14and serve as splines for maintaining relationship between the twosleeves.

Means are provided for operating the collar 16 and sleeve 21. inde'iemlently of each other, said means comprising for collar 16 a lever22, carried by a rock-shaft 23, mounted in bearings 24 of the frame,said lever having a fork fitted in a groove 27 of the collar 16. lnthelower end of lever 22 of fork is a stud 28, connected by a link 2%) witha pin 30, secured in an arm 31, which is mounted for movement with asleeve 32, journaled in a tubular bearing 33 of the frame, said bearingbeing provided with a flange 33 for limiting its position. At the otherend sleeve 32 is provided with a hand-lever 34, whereby said sleeve maybe rocked to shift the collar 16 upon the sleeve 14 when required.

Mounted for movement within the sleeve 32 is a shaft 35, the outer endof which carries r lever 36, and upon the inner extremity of said shaftis secured a forked arm 37, connected by a pin 38 to a link 39, theinner end of which is attached to a lever 40 by a pin 41, said leverbeing Sckllltd to a rock -shaft 42, having a fork 13, provided withshoes 44, fitted in a groove of the. sleeve 21.

Any suitable mechanism may be employed for advancing stock to andthrough the chuck until the proper gaged length projects therefrom; butI have shown for this purpose What is terme( roller feed meehanism ofthe type described in my Patent No. 711,851, dated October 21, 1902.Referring now to this mechanism, 48 designates in a general way a chuckcarried by the spindle 11, and this chuck is equipped with rollers 49,having peripheries shaped to engage and rotate the stock, the outer ring50 being provided with mm-surfaws 50 for advancing and withdrawing saidrollers and the said ring having an opening 50*, in which a tool may beinserted when it is desired to turn the ring to adjust the rollers, allas in the patent aforesaid.

Designated generally by 51 is the feedohuck proper, and it has a hub 52fixedly secured 111 a bearing 53 of the frame and is equipped with aseries of obliquely-disposed rollers 54, which are journaled in blocks.55, movable toward and from the work by the cam-ring 56 of the chuck, asin the patent ELfO'lGSzlld. In this chuck it is important that theobliquely-disposed feed-rollers should be withdrawn from the stock whenthe jaws of chuck 6 closed and that said feed-rollers should be forcedto engage the stock when the chuck-jaws are open, and 1 accomplishlthese results in the following manner: Designated by 57 is a lever havinga cam-groove 58 in one end for the reception of a pin or lug 59,projecting from the cam-ring 56 of the feedchuek 51, and this lever issecured by a pin 60 or otherwise to a roclcshaft 61, journaled in l)earings of an extension 612 of the frame 2, and is bifurcated at itslower end to receive the end of a link 63, secured in position by a pin64. A spring 65, connected to the pin 64 and to the frame, normallytends to throw the lever 57 to the position illustrated inFig. 3,thereby causing the cam 58 offlsaid lever to actuate the ring 56 andshift the blocks in which the feed-rollers are journaled away from thestock. A slot 63 is formed in the inner end of link 68 to enable saidlink to move within limits upon the pin 28 of lever 22, as shown in Fig.3.

W hen it is desired to start. the feed mechanism, the hand-lever 3 1- isgrasped and shifted to the left, thereby rocking arm 31 in the samedirection and causing the l nk 29 to push lever 22 and throw the fork 25to the right, thus moving the collar 16 and its racks also to the rightand rotating the spiral gears 18 and their right-and-left screws 13 13in such direction that the sleeve 14 will be forced back to carry theshoulders 15 of le vers 15 away from the end of the ehuck-actw atingsleeve 0 and permit said sleeve 9 to be driven rearward by spring 10 andthe chuck YOC 6 to open to the position shown in Fig. 3. As

lever 22 moves to the left the pin 28 first travels along the slot 63 oflink 63 without actnati g said link and the cam-lever 57 to which it isattached; but the chuck '6 having opened finally engages the end wall ofsaid slot, shifts said link to the left, and rocks the cam-lever againstthe action of spring 65, and whose cam 58, in engagement with pin 59,throws the cam-ring 56 to a position to close the obliquely-disposedfeed-rollers upon the rapidly-rotating stock, which will now be advancedthrough the chuck to the desired extent. A reverse movement of the leverS t-to the position shown will of course cause the cam-lever 57 to be immediatcly shifted in the opposite direction to stop the feed, and thiswill occur just arior to he preliminary closing of the chuck 6 upon thestock by the instrumentalities described when said lever 34 is forced tothe right.

My improved mechanism opmates as follows: Power is applied to the mainspindle 11 by a. belt upon the driving-cone 4-6, usual IIC back gearinconnecting said cone with the spindle. Ater stock has been fed forwardthrough the chuck -48,the sleeve 9, and chuck 6 to cause its end toproject beyond said chuck 6 for the required distance the hand lever 34,the hub of which is keyed at 34 to sleeve 32, is rocked to the positionshown in Fig. 1, thus through the connections described actuating thecollar 16 toward the left and causin the racks 17 of said collar, whichslide in s ots 14 of sleeve 14 ano prevent the collar from rotating, toturn the spiral gears 18 and through the right and left hand screws 13and 13 force sleeve 14 to the right. (See Figs. 1 and 8.) Inasmuch asthe projections 15 of levers l5, pivoted in sleeve 14, 21min engagementwith the end of the sleeve 9, it follows that said sleeve 9 will also beforced toward the right, so that the inner tapered'wall of the head 8thereof will become effective in contracting the chuckjaws 7 to closethe same against the work with a preliminary clamping action, and saidwork being now firmly held in position further longitudinal movement maybe given to the sleeve 9, while the sleeve 14 is stationary, and this isaccomplished by actuating the sleeve 2] In bringing this part of theinvention into action the lever 36 is grasped and pulled from theposition shown in Fig. 1 to ward the right, thus actuating the shaft 35and its arm 37 and the link 39 in the same direction and swinging thelever 40 and its fork 43, the latter moving the sleeve 21, carrying thecam-plates 20, toward the left, causing said cam-plates to becomeeffective in rocking the levers 15 around their pivots 15 to throw thefree ends thereof toward the axis of the spindle a distance determinedbythe shape of said cam-plates 20, and thereby imparting a powerfulauxiliary thrust to the sleeve 9 and jaw-actuator 8, the latter forcingthe chuck-jaws firmly into contact with the stock, and thus causing themto firmly secure stock of different diameters. As will be obvious, theright-hand threads 13 will move in or out of the nuts in collar 12,rigidwith the spindle, according to the direction in which the screws areturned, and this will result in an endwise travel of the screws 13 andtheir spiral gears 18, and inasmuch as the left-hand threads 13 aresimultaneously turning in the nuts 14 ofsleev 14' it will be seeif thatsaid sleeve will..be actuated with multiplied. speed in its movements onthe spindle toward and from thiestock-chuck, the reverse position of theaot'hating screw and sleeve being shown iii F i 9.

Stock often varie sin diameter throughout its length, and thereforeithas been" a roblem how to secure it firmly by the c uck. With theordinary machine'the tails or free ends of the toggle-levers in contactwith the chuck-actuator sleeve frequently flex or bend under thepressure applied ,to them and the chuck-jaws are not forced into firmconfer! with the stock. in my invention on the forward movement ofsleeve 14 the projections 15 of toggle-levers l5 advance the rhurleactuator and cause it preliminarily to close the chuck upon the stock,and if the part of said stock Within the chuck should be of standarddiameter the chuelvpiws will of course grasp it. If, however, said partof the stock should be of less diameter than standard, then theadditional impulse applied to the sleeve t) by levers 15 when operatedby the cam-plates 2O will cause the chuclejaws to move farther inward.and t engage and firmly clamp said stock. Ste diameter may tln. cforc beiirmiy set in the chuck by simple mechanism, an, clamping action of thechuck \vili not be affected by variations of diameter of v: portions ofthe stock bar or red. in is way the problem of, firmly securing stock ofvarying diamet r by one and the san'ie chuck has been solved, and meansfor plishing this resuit constitute one of the sulient features of myinvention.

In mechanism in which pivoted lever" erated bya sliding-cone areemployed (rem ugal force due to the rapidly-retating spindle has atendency to throw the ends of levers outward, and thus prevent the vidrawai of the chuck-actuating sleeve at times when the chuck should opento permit a new feed. In the present construction the lovers 15 areprevented from outward imivement by centrifugal force'to release thechuck by the sleeve 21, and consequently the chuckactuating sleeve 9 iskept under perfect control, and the chuck can either be closed orpermitted to open without derangement in timing of either of saidfunctions. Furthermore, in my improved machine a series of chuck, thechuckwiil open and the feed mech anism will operate while the spindle isrotating, thereby dispensing with the necessity of stopping the machineto impart an additional clamping impulse to said chuck.

Either chuck-closing mechanism may be used independentl of the other, ifdesired, the invention not eing limited to their conjoint employment. Inother words, the mechanism for preliminarily closing the chuck maysometimes be relied upon, if desired While particular mechanism is shownand described for im arting two clamping impulses to the ehucrr-jaw'aitis distinctly'to be understood that my invention is not limited in thisrespect. So, too, any suitable feed mechanism may be substit u ted forthat shown, ifdesired, and changes may be made in the form, proportions,and location of the parts, the invention not being limited to the construction described. Again, the independent mechanisms for impartingprimary and secondary closing movem to. the chuck varying in may beoperated autoinat'icallv, i'l" desired, the. invent ion not. beinglimited to the manual devices shown.

Having thus described my invent ion, what I claim is l. 'lheeoinhitnttion, with, a spindle, and its (ltttt'l\', of a sleeve su'ounding the spindle; means l'ot' aetnatingsaid sleeve; :1 chuck-:tt'ltlztlflt'; devices carried h the sleeve. for imparting apreliminary movement to the ('lltt 'kwttlltzttot' to close theclutch-jaws; a second sleeve movahle on the lirst named sleeve; meanscarried by said seeond sleeve in; imparting an additional movement tosaid deviees ttveouse tho eliuek-acttnttor toreihly to compress saidchuck-jaws upon the stock; and means independent ol' those for.ipcrating the first sleeve l'or actuating said second sleeve.

2. The combination, wit h a spindle and its chuck, ol' a sleeve movableon said spindle; mechanism for independently actuating said sleeve:means controlled h v said sleeve for preliminarily closing the chuck; asecond sleeve movable. on the lirst sleeve; means controlled by thesecond sleeve for impartin a final (losing movement tosaid chuck; ant,devices indc 'icndent ol' thosdtor operating the lirst sleeve, foractuating said second sleeve. 4

3. The eomhination, with a spindle and its clnicl-z, of ariglit-and-lett screw; a. device rigid with the spindle, and into whichone section of said screw ,is threaded; means for actuathn; said screw;and means actuated by the screw lor closing the chuck."

4. The cmnhination, with a tubular spindle, of a chuck carried bythespindle; a chuckclosing device within the. spindle; a sleeve carriedby the spindle; means actuated by said sleeve l'or imparting apreliminary closing movement to said dwelt-closing device while thespindle is in. rotation; and a second sleeve movable on the other sleevefor actuating said means and imparting a final closing movcn'ient tosaid (dutch-closing device while the spindle is in rotation, and meansindependent of those. tor actuating tho first sleeve for operating saidsecond sleeve.

5. The combination, with a. tubular spindle, and with a chuck carried bysaid s indie, said chuck being composed of jaws liaving conical outersurfaces, of a clutch-actuator having ahead shaped toengagc thcoutersurfaces of said jaws; a sleeve movable upon the spindle, and havingthreaded seats; a collar on the spindle, and also having threaded seatsof reverse pitch to those of the sleeve; righhand-lett screws forengaging the seats in said collar and. sleeve; means for actuating saidscrews; and devices carried: by the sleeve, and having parts incngagement with. the chuck-actuator.

6. The combination, with a tubular spmdlc, of a chuck carried by saidspindle; a clutch-actuator within the spindle; a slotted sleeve movableupon the spindle; levers pivoted to said sleeve and working in the slotsthereof, said lovers havin projections in engagt-tnent with the chuc-actuator; and a second sleeve movable upon the first-named sleeve, andhaving cam-plates extending into the slots of said first-named sleeveand engag: in said levers.

I. The combination, with a tubular spindie, of chuck-j aws havingconical peripheries a chucit-actuatorwithin the spindle, and having ahead eonit'irming on its inner side to the peripheries of said jaws; asleeve slidable upon the spindle; nuts on said sleeve; rightandlc'l'"tscrews for actuating said sleeve;

nuts carried by the spindle; gearing for actuating thescrews; anddevices carried by the sleeve. and 111 contact with the end of thechuck-actuator.

S. The combination, with a tubular spindle and its chuck; ofachuck-actuator; a slotted sleeve movable upon the spindle; means foractuating said slottcdsleeve; levers pivoted in the slots of the sleeve,and having projections adapted to engage the rear end of thechucloactuator; a second sleeve movahle upon the first-named sleeve;cam-plates on the inner side of said. second sleeve projeeting into theslots of the slotted sleeve, and serving to lock the same againstindependent rotation on thc'first sleeve, said cam-plates acting againstthe rear ends of the pivoted levers; and means for actuating said secondslceve.

9. The combination, with a tubular spindle havin a head, of chuck-jawsmounted in said heat a chuck-actuator; a sleeve surrounding and movableupon the spindle; a collar rigid. with the spindle; right-and-lef-tscrews working in the sleeve and collar; gearing for actuating saidscrews; and means car ried by the sleeve for operating thechuckactuator.

10. The combination, with a tubular spindlc, of a chuelccarried by saidspindle; a sleeve within the spindle, and having a portion shaped toactuate the chuck'; a sliding sleeve upon the spindle; means carried bythe sliding sleeve for engaging the chucl ac tuating sleeve; a screwengaging a nut in the sliding sleeve; relatively Iixed device ongagedbythe screw; a gear carried by the screw; and means for actuating saidgear.

11. The combination, with a tubular spindle, of a chuck carried bysaidspindle; a sleeve within tlle'spindle, and having a head for actuatingthe chuckja sliding sleeve upon the spindle; means carried by thesliding sleeve for engaging the chuck-actuating sleeve; a right and lefthand screw having an intermediate gear a device carried by the spindlcand having a nut for engaging one sleeve slidable "1mg sleeve forengaging the other section of said screw and means for rotating saidgear.

12. The combination, with a tubular spindle, of a chuck mounted Withinahead of said spindle; a chuck-actuating sleeve mounted within thespindle, and having a head shaped to engage and contract the chuck jaus;a sliding sleeveupon the spindle, said sleeve having a nut; meanscarried by the sliding sleeve for engaging the chuckactuating sleeve; acollar on the spindle having a nut; aright and left hand screw having anintermediate gear; a rack for actuating said inte 'inediate gear; onemeans for reciprocating the rack. 1 13. The combination, with. a rotaryspin- 7 and its chuck, of a chuclcactuator; a colsecured to the pindleand having a nut; a screw engaging the nut; a sleeve operated by thescre v; .neans for rotating the screw; and mes; s on the sleeve forel'igaging the cl'iucl actcater 14. The combination, With a spindle andits chuck, of a chuck-actuator; a sleeve on the spindle; levers pivotedtosaid sleeve and l'iav'ng parts in engagement with the c. iclf.-a-tuutor; means for actuating the sleeve; a second sleeve mountedforsliding movement on, and rotation with, the other sleeve, means foractuating said second sleeve; and camplates carried by the second sleevefor opera lg the pivoted levers, said cam-plates urlnng in. grooves ofthe hrst sleeve.

5. The combination, with a tubular spinal and a chu'clrsupported in ahead thereof, of a sleeve having a chuck-actuator, said sleeve singmounted in the spindle; a collar rigid with the sleeve and having a pairof nuts; a sleeve loose upon the spindle, and having nuts of reversepitch to those of said collar; 2, pair of right-and-left screws, eachhaving a ear; means carried by the sleeve loose on t 1e spindle forengaging the sleeve Within the spindle; and means for engaging saidgears and thereby rotating the screws.

16. The combination, With a tubular spindle and a chuck supported in ahead thereof, of asleeve Within the spindle a chuck-ac tustor rigid withsaid sleeve; a device rigid with the spindle, and having a nut; a sleeveloose upon. the spindle, and having a nut of reverse pitch to that ofsaid device; means on said sleeve for en aging the inner sleeve; a rightand left han screw engaging said nuts, and having an intermediate gear;a rack for rotat ing said gear; and means for actuating the rack.

17. The combination, with a tubular spindle having a head, of a sleevewithin said spindle and carrying a chuck-actuator, a chuck ithin thespindle head; a collar secured to the spindle, and having nuts; a uponthe spindle, and having pitch to those of the collar;

nuts of reverse and. 1n engagement with the chuc means carried by theslidable sleeve and bearing against the sleeve carrying thechuck-actuator; right and eft hand screws in engagement with the nuts ofsaid slidable sleeve and said collar; a spiral gear on each screw inter-7o mediate the reversely-pitched parts thereof; racks for rotatin saidspiral gears; and means for actuating said racks.

18. The combination, with a tubular die, of a chuck carried sleeveWithin the spindle; a chuck-actuator carried by the sleeve; a collar onthe spindle, said collar having a nut; a sleeve slidable upon thespindle and having a nut of reverse pitch to that of the collar; meansfor engaging said sleeve with the sleeve in thespindle a screw havingright and left hand threads engaging said nuts, and a spiral gearintermediate said threads; rack in mesh with said spiral gear; andmeI-ns for actuating the rack.

18). The combination, with a tuluilar spindle, or a chuck carried bysaid spindle; a Within the spindle; a chuck-actuator carried by thesleeve; a collar on the spindle,

having nuts ,1 slee e slidablc on the spindle, and provided with nutsreverse in pitch to those of the collar; screws having rightan -:l-l aftsection .genient with 'the'nuts, and spiral gee mediate said sections;racks itor actuatin said spiral gears; a carrier for the racks; an meansactuating said carrier.

The coinhiuation, w a tubular spin- '1 red by said spindle; means foractuating the chuck; a collar on the spini a slidable device,

dle, said collar having a nut constituting a pa t of thedwelt-actuating. means, and having a nut of reverse pitch to that of thecollar; a screw having right-andlelt sections in engagemen with saidnuts, I05 and a gear intermediate saio sections; a rack in engagementwith said gear; a carrier for the rack; a lever connected to saidcarrier; and means for actuating the lever.

L1. The combination, with a spindle, and no with :L chuck carriedthereby, of chuck-actuator Within the spindle; a surrounding thespindle; means carried by the sleeve uClillli-tOI', a collar on thespindle, said collar having op- I I 5 positelydisposed nuts;oppositelydisposed nuts reverse in pitch to those of the collar in thesleeve upon the spindle; right and left hand screws engaging said nuts;gears carried by said screws; a sliding collar upon the I20 sleeve;racks carried by said collar, and in en gagement with the gears of thescrews; and means for actuating the rack-carrying collar. 22. Thecombination, with a tubular spindle having a head, of a sleeve Withinsaid spin- I 25 dle, and having a head with an inclined, inner surface achuck, the jaws of which have conical peripheries a sleeve fitted forsliding movement onthe spindle; means carried by the sleeve forimparting forward movement 11 .0

' ION 50 devices carried by to the sleeve Within tho spindle; right andleft hand screws in engagement with nuts carried by the spindle and bythe sleeve movable the eon: spiral gears on said screws; racks inengagement with said spiral gears; a collar movable upon the sleevesurrounding the spindle; a lever for actuating said collar; and.lever-and-link mechanism for operating the lever.

23. The combination, with a spindle, of a chuck carried by said spindle;a chuck-actuator Within. the spindle; a sliding sleeve surrounding thespindle; levers pivoted within the sleeve and having projections forengag- I 5 ing the chuck-actuator; a second sleeve surrounding the othersleeve; cam-plates carried by said second sleeve, and in engagement withthehee ends of said pivoted levers; mechanism for sliding the primarysleeve upon the spindle to impart a reliminary movement to thechuck-actuator and means for independently actuating the second sleeveto cause the levers to impart a linal movement to said cluick-actuator.

2 5 24. The combination, with a tubular spindle, and its chuck, of achick-actuating sleeve within the spindle, and having a head to engagesaid chuck; a sleeve surrounding the spindle, and having internalthreads at 0 its forward end; means on said sleeve for en gaging thechuck-actuating sleeve; collar 'on the spindle having internal threadsreverse in pitch to those of the sleeve upon the spindle; aright-and-left screw engaging the 3 5 threads of said sleeve and saidcollar; a spiral gear carried by said screw; a collar surround 1n thesleeve on the spindle; a rack on the co lar and in. engagement with saidspiral gear; a fork for reciprocating the collar; and 40 means foractuating the fork,

25. T he combination, with a tubular spindie, of a sleeve within saidspindle; a'chuck carried by the spindle, and actuated by a part of thesleeve; a sleeve surrounding the spindle and having internal threads; acollar on the spindle having internal threads of re verse itch to thoseof the sleeve; ri ht and left screws engaging the threads of said sleeveand collar; spiral gears rigid with said screws; the sleeve on thespindle for engaging the sleeve within the same; a collar surroundingthe sleeve on the spindle; racks carried by the collar, and in mesh withthe spiral gears of the screws and lever-andlink mechanism for actuatingthe rack-carrying collar. 26. The combination, with a tubular spindlehavinga head, of a sleeve within the spindle, and having a head with aninclined, 'inner surface; a chuck having an inclined peripheral surface;a sleeve slidable upon the spindle; levers pivoted to said sleeve, andhaving projections in engagement with the end of the inner sleeve;mechanism for reciprocating the sleeve upon the spindle; a sleevesurrounding said sleeve upon the spindle; cannplates carried by thesurrouiuling sleeve, and in engagement with the free ends of the pivotedlevers; a fork having projections litted in a groove ol the surroundingsleeve; a lever for actuating said fork; a link connected at one end tothe lever; a rock-arm to which. said link is also connected; and meansfor actuating said rock-arm.

27. The combination, with a tubular spindle and its chuck, ol' an innersleeve having a head 'or actuating the chuck; a sleeve surroumlinp jhspindle, and having nuts: levers pivoted td said sleeve and inengagement with the end of the inner sleeve", a collar sccured to thespindle and having nuts ol reverse pitch to those ol' the outer sleeve:right and leit hand screws in engagement with. the nuts oi the sleeveand collar. spiral gears carried by said screws; a collar on the outersleeve; racks on said collar, and in mesh with the spiral gears; :1.pivoted fork l'or reciprocating the collar; a link comnwtrd lo an armol' said lurk: n. rock-arm; and means for actuating said I'mk-ztllii.

28. in mechanism ol' the class descrilutd, the combination, with atubular spindle, ot a sleeve within said spindle; a chuck adapted tobeactuated by a part oi said sleeve, an outer sleeve having nuts; pivotedlevers carried by said oute "sleeve, and havingprojections in engagementwith the inner sleeve; a collar securedto the spindle, and l avingnutsoi apitch reverse to those of said outer sleeve left hand screwsengaging the nuts oi the outer sleeve and collar; spiral gears carriedby said screws; a rack-carrier upon the outer sleeve; racks supported bysaid carrier, and in mesh with. the spiral gears; a fork forreciprocating the rruwk-carrier; lever-anil-link mechanism foractuatii'ig the fork;

camplates carried by said second sleeve, and in engagement with the freeends ol the pivoted levers; a fork for reciprocating said. secondsleeve; and lever-and-link mechanism for ac tuating said fork,

In testimony whereol 1 atlix my signature in presence of two witnesses.

, BENGT M. W. HANSON.

Witnesses:

rigl it and;

a second, sleeve movable on said outer sleeve;

